dev comment logic for check max users

src/main/java/ru/soune/nocopy/service/file/impl/FileUploadServiceImpl.java

@@ -322,13 +322,14 @@ public class FileUploadServiceImpl implements FileUploadService {
 
                         File file = new File(finalFilePath);
 
-                        if (session.getFileType().startsWith("audio") && !isWavFile(file)) {
+                        if (session.getFileType().startsWith("audio") && !isValidWav(file)) {
                             session.setStatus(UploadStatus.FAILED);
                             session.setLastError("wav file not have RIFF header");
 
                             sessionRepository.save(session);
 
-                            throw new FileFormatException("Failed to upload chunk: .wav file not have RIFF header");
+                            throw new FileFormatException("Failed to upload chunk: .wav file not have RIFF header or " +
+                                    "another problems with .wav file");
                         }
 
                         FileProtector.Type type = "document".equals(session.getFileType()) ?
@@ -431,6 +432,67 @@ public class FileUploadServiceImpl implements FileUploadService {
         }
     }
 
+    public static boolean isValidWav(File file) {
+        if (file == null || !file.exists() || file.length() < 44) {
+            return false;
+        }
+
+        try (FileInputStream fis = new FileInputStream(file)) {
+            byte[] header = new byte[44];
+            if (fis.read(header) < 44) {
+                return false;
+            }
+
+            if (header[0] != 'R' || header[1] != 'I' ||
+                    header[2] != 'F' || header[3] != 'F') {
+                return false;
+            }
+
+            if (header[8] != 'W' || header[9] != 'A' ||
+                    header[10] != 'V' || header[11] != 'E') {
+                return false;
+            }
+
+            if (header[12] != 'f' || header[13] != 'm' ||
+                    header[14] != 't' || header[15] != ' ') {
+                return false;
+            }
+
+            if (header[36] != 'd' || header[37] != 'a' ||
+                    header[38] != 't' || header[39] != 'a') {
+                return false;
+            }
+
+            int audioFormat = (header[20] & 0xFF) | (header[21] & 0xFF) << 8;
+            if (audioFormat != 1 && audioFormat != 3) {
+                return false;
+            }
+
+            int numChannels = (header[22] & 0xFF) | (header[23] & 0xFF) << 8;
+            if (numChannels < 1 || numChannels > 8) {
+                return false;
+            }
+
+            int sampleRate = (header[24] & 0xFF) | (header[25] & 0xFF) << 8 |
+                    (header[26] & 0xFF) << 16 | (header[27] & 0xFF) << 24;
+            if (sampleRate < 8000 || sampleRate > 192000) {
+                return false;
+            }
+
+            int bitsPerSample = (header[34] & 0xFF) | (header[35] & 0xFF) << 8;
+            if (bitsPerSample < 8 || bitsPerSample > 32) {
+                return false;
+            }
+
+            return true;
+
+        } catch (IOException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+
     private int protectCost(String fileType) {
         int cost = 0;